Preheat your gas grill to 375-400°F. Coat the prepared radishes with oil spray and sprinkle with fine salt evenly. Place the prepared radishes on the preheated grill, cover, and cook.
After 8-10 minutes, turn the radishes over (there should be grill marks on the radish sides that are facing the grill) and cook for 8-10 minutes until tender and cooked through.